Experiment dataset of dynamic properties of damper material derived from automotive spare parts as passive control devices for retrofitting existing buildings

The data collection provides two clusters: rubber materials and dampers as passive energy dissipation devices that are selected from existing systems in automotive spare parts, namely rubber from engine mounting rubber, shock absorbers, and engine mounting rubber (EMR). Variable depending on the brand, number, and size of the rubber used by the manufacturer. Data on EMR rubber materials, such as ultimate tensile strength, axial elongation, hardness, and density. Data for EMR as a system, including data from static and dynamic tests. The parameters measured are stiffness and damping ratio. The area and shape of the hysteresis curve are used to determine the damping ratio. The data presented in the article will allow researchers to validate the dynamic models for several designs of dampers, such as a damper with a single EMR and a damper with a group of EMR systems.


Specifications
Civil and Structural Engineering Specific subject area Damper, Shock absorber, Engine mounting rubber, Free vibration analysis, Structural Dynamic Type of data

Value of the Data
• Data can be used to inform researchers and building construction professionals about the importance of seismic mitigation and rehabilitation due to the high risk of earthquakes, especially in developing countries that can get damper devices easily and cheaply. • Data can be used to guide the designers and construction industries on the concepts of retrofitting existing buildings with damper devices, which is very necessary in seismic design. • Researchers that work with modeling software and computational procedures can use the data to improve the performance of existing buildings and remodel them, ensuring that the structures are designed to withstand earthquakes. • Data can be employed in choosing the most appropriate damper devices to be considered in retrofitting low-rise buildings or simple houses, with the advantage of ease of installation and no expertise required.

Objective
Data is collected for the purpose of enabling engineers and researchers to develop simple earthquake dampers.

Shock Absorber (SA) Data Test
Tables 1-5 illustrates the specimens of Shock absorbers variant (see Table 11 ) that were tested using an auto-damping force tester (see Fig. 1 ) with certain displacement controls and velocity speeds from 0.05 m/s to 0.6 m/s. The parameters observed are the rebound and compress values, which are the resistance values of the fluid system due to being given a pulling and pushing force at a certain speed (7 cycles).      Table 6 illustrates two brands of EMR, HINO (V-H) and Mitsubishi (V-M) with their performance index of Tensile strength, Break elongation, Hardness, and Density. Tensile strength and break elongation specimens shaped as dumbbell (narrow section's length 20 mm and thickness 2 mm). The maximum stress at which the specimen will break is measured as force per unit of cross-sectional area. The greatest extension before the sample is broken is measured as the elongation at break (%), which is expressed as a percentage of the initial length.    Table 8 is an analysis of the data from the free vibration test on seven EMR rubber variants with fifteen rubber number design variations (single -S, double -2R, and four rubber -4R). The damping ratio results ( ξ , %) are taken from the decay behavior analysis.  Table 9 describes the data analysis of the damping ratio value to the stiffness value on the V6-S damper specimen with a displacement load input of 12.5 mm. performed on frequency cycles of 0.5, 1.0, 1.5, and 2.0 Hz.  Table 10 describes the data analysis of the damping ratio value to the stiffness value on the V6-S damper specimen with a displacement load input of 18.75 mm. performed on frequency cycles of 0.5, 1.0, 1.5, and 2.0 Hz.

Shock Absorber Test
The shock absorber variant in Table 11 was carried out with a damping test using the Auto Damping Force Tester machine at PT Kayaba Astra Indonesia ( Fig. 1 ). One variant is given a displacement control of 15 mm and the other 4 variants are given a displacement control of 25mm, all variants are given the same temperature conditions of 20 °C. Temperature conditions must be measured because temperature greatly affects the fluid in the damper device, so that each specimen must be at the same temperature so that the results can be compared. In one testing stage, each specimen is given a velocity force with a speed level that changes from low to higher with a speed range between 0.05 m/s to 0.6 m/s.

Rubber Characterization Test
The experiment was carried out in the testing laboratory of Center for Leather, Rubber, and Plastics Yogyakarta, Indonesia. The test was carried out on two types of EMR rubber from two types of manufacturers with different brands of automotive spare parts manufacturers, brand from automotive companies HINO and Mitsubishi, namely V-H and V-M ( Fig. 2 ). The tensile strength and break elongation test method in accordance with ISO 37: 2015 (IDT-2011) (Rubber, vulcanized or thermoplastic -determination of tensile stress-strain properties) [2] ( Fig. 3 ). The hardness according to ISO 7619-1: 2010 (Rubber, vulcanized or thermoplastic Standard -measurement of identifying hardness -durometer method/Shore Hardness) [3] ( Fig. 4 ). The density   test uses an electronic densimeter with a resolution of 0.01 and follows ISO 2781: 2008 (Rubber, Vulcanized or Thermoplastic -Determination of Density) [4] ( Fig. 4 ).

First Stage (Static Test)
Engine rubber mounting (EMR) ( Fig. 5 ) is one of the vehicle components that is composed of high-damping rubber material that functions as a holder and damper for engine vibration so that vibration does not spread to the car frame, which then spreads to the passenger cabin. Experiments carried out at PT Kayaba Astra Bekasi Indonesia. Placing instrument as illustrated in Fig. 6 . One of the holders (the upper side) is pulled in line with the damper device by controlling a specific displacement as required. The damper device is attached to both sides of the holder. By pulling the damper device, it will be possible to observe how the material responds to the  pulling force and how significantly it has lengthened. Load values and displacement values are measured parameters that are digitally read by a computer. A tensile profile-a curve illustrating the relationship between the pulling force and the change in length-is obtained by pulling the material. The first stage of testing the damper properties was carried out on five variants of damper devices with rubber material ( Table 12 ).

Second Stage (Static Test)
Carried out completely at the Gadjah Mada Structure Laboratory, setting up as shown in Fig. 9 . The eighth of EMR variants and sixteenth of damper designs were tested ( Table 12 -13 -14 ). The damper design was developed from one rubber, two rubbers, and four rubbers ( Fig. 7 -8 ). Static tests are carried out by using the system and instrumentation on a loading frame with the loading and unloading method. Two LDVTs are installed above and below the damper device to control and read displacement, respectively. Loading and unloading data is assisted by a load cell measuring instrument. Giving load and unload by pulling manually with a hydraulic jack. All LVDT measuring instruments and load cells are computerized using Dewesoft X3 software so that data on load values and displacement values can be obtained ( Fig. 9 ).

Third Stage (Dynamic Test)
The dynamic test was carried out using two laboratory testing methods: the free vibration test and the shaking table test. A free vibration test was carried out to obtain decay behavior on the damper. The seven of EMR variants and fifteenth of damper designs were tested ( Table 15 ). As seen on Fig. 10 , The specimen is hung on the loading frame with one of the upper damper handles clamped and the other side of the bottom handle free. The load will be hung on the free side of the handle, with a rope serving as the connecting medium between the handle and the load. The rope will be cut to get a free vibration response from the damper. The accelerometer is placed on the side of the damper that is not clamped to obtain an acceleration response over time ( Fig. 11 ). The decay behavior is obtained due to the material's role as a damper, and the frequency response is obtained by the Fast Fourier Transform (FFT).
The dynamic test also involved the EMR damper material on a shaking table instrument with dancing earthquake software and Dewesoft X3 software ( Figs. 12-13 ). The load protocol on the shaking table input had two variations of displacement control (12.5 mm and 18.75 mm) and four variations of frequency (0.5 Hz, 1.0 Hz, 1.5 Hz, and 2.0 Hz). The damping ratio ( ξ %) is calculated by calculating the area of the hysteresis loop curve.

Ethics Statements
The author has complied with Elsevier's 'Ethics in publishing' policy. Does not involve human subjects, animal experiments, and data collected from social media platforms.

Declaration of Competing Interest
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.